Micromorphological characteristics of a marine ferromanganese crust
Alvarez, R.; De Carlo, E.H.; Cowen, J.; Andermann, G. (1990). Micromorphological characteristics of a marine ferromanganese crust. Mar. Geol. 94(3): 239-249
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151, more
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| Keywords |
Chemical compounds > Oxygen compounds > Oxides
Chemical compounds > Oxygen compounds > Oxides > Manganese compounds > Manganese oxides > Ferromanganese oxides
Chemical elements > Metals > Transition elements > Heavy metals > Iron
Chemical elements > Metals > Transition elements > Heavy metals > Manganese
Chemical elements > Metals > Transition elements > Heavy metals > Titanium
Geological oceanography
Marine geology > Geological oceanography
Resources > Natural resources > Mineral resources > Mineral deposits
Resources > Natural resources > Mineral resources > Mineral deposits > Seabed deposits
Marine/Coastal |
| Authors | | Top |
- Alvarez, R.
- De Carlo, E.H.
- Cowen, J.
- Andermann, G.
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| Abstract |
Marine ferromanganese oxide crust fragments sampled from a massive equatorial Pacific Ocean crust deposit exhibit distinct micromorphological features and a microchemical distribution which have not been previous reported. Black, shiny upper layers of the crust display a prismoidal microstructure and a unique crystallite habit expressed by a mosaic-like design of hexagonal and pentagonal columns. This columnar arrangement, which has been previously reported on a scale of a few millimeters in other marine Fe-Mn deposits, extends vertically for several centimeters and is observed throughout the entire horizontal plane of growth of the crust, and is the largest scale of morphological regularity observed in marine Fe-Mn deposits to date. The polygonal columnar structures which constitute the crust are mainly composed of Mn, Fe, and Ti oxides. Aluminium- and Si-rich intercolumnar space (lamellae) surrounds individual columns and sharply defines each polyhedron. |
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